Ventilator



1 McGEORGE."

VENTILATOR.

APPLICATION FILED MAR. 4, 1918.

Patenggd Ma 1275172272 Wd J 'UNITED STATES PATENT OFFICE.

JOHN MoG-EORGE, 01? LAKEWOOD, OHIO, ASSIGNOR TO THE OHIO BOD? & BLOWER COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO. T

VENTILATOR.

' Specification of Letters Patent. P t t d May 1921 Application filed. March 4, 1918. Serial No. 220,170.

, To all whom it may concern:

Be it known that I, JOHN MoGEoRen, a

citizen of the United States, residing at Lakewoochin the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvementin Ventilators, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings.

This invention relates to ventilators, and has for its general object to produce a ventilator cowl which can not only be manufactured in a particularly simple and inexpensive manner but which will combine such economy of production with a maximum efficiency of operation.

The cowl illustrated and described herein is one which is designed more particularly for use with vessels, in connection with the production of a forced draft, but it will be understood that it is adapted for use as'the cowl of an exhaust ventilator and for uses other than marine installations. I

Cowls of the general type illustrated herein have usually been constructed from a plurality of metal sheets extending transversely of the length of the cowl, and with no special relation between the cross sections of the enlarged or flaring portions of the cowl and the cross section-of the lower or air-shaft end thereof. The cowl forming the subject matter hereof employs in its construction longitudinally and transversely curved metal sheets extending longitudinally of the cowl and the cowl is so shaped that the cross section of its enlarged end preferably bears a definite relation to the cross section of the lower or air-shaft end thereof. Furthermore the cowl is so shaped and certain of the metal sheets thereof (the central longitudinal front sheet and the central longitudinalrear sheet) are so arranged and shaped as to enable them to be produced by a rolling operation, whereby the cost'of production of these sheets and of the cowl is materially decreased as compared with the construction of any other cowl or cowls that have heretofore been constructed.

In the drawings forming part hereof,-

Figure 1 represents a side elevation of a cowl embodying the invention; Fig. 2 a rear elevation of such cowl; and Figs. 3, 4, and 5 are cross sectional views corresponding re spectively to the lines 3-3, 44 and 5-5 of Fig. 1.

mere stretching operation.

' Describing .thevarious parts illustrated hereln by reference characters, 1 denotes the lower or air-shaftend of the cowl, said iower end being circular in cross section and 1n the embodiment shown herein, mer in with the flaring upper end of the cowl. b A s illustrated, herein, the mouth of the cowl is elllptlcal, the longer axis of the ellipse being vertical.

The cowl is shown as formed from lon itudlnally extending metal plates, the fro nt plate 3 and the rear plate 4 being curved longitudinally in accordance with the par-- tlcular longitudinal curvature to be given to the cowl and being transversely curved on an arc of a circle the radius whereof is the radlus of the lower end or air-shaft portion lof said cowl, as indicated by the circles on F 1g. 2. The; front plate 3 and the rear plate 4 are preferably. of uniform width throughout their longltudinal extent and the space between said plates is closed by means of side plates 5 which are longitudinally and transversely curved so as to form with said front and back plates'a chamber varying 1n cross-sectlon from a circle at the lower end of the cowl to approximately an ellipse atthe upper and; front end thereof.

It has been found to be ofmaterial a'd- By giving to the front and back plates the peculiar form shown and described, these plates may be rolledto shape, which enables the cowl to be produced at a material saving of labor and expense over any other cowls of like dimensions with which I am familiar; this peculiar form. also enables these plates to be formed by dies which can be easily designed, cheaply constructed and which will form the plate by substantially a Furthermore, by the shape of the cowl as a whole (the major axis of the elliptical mouth being one and one third times the minor axis) a maximum efliciency is secured in the movement of the air through the cowl with a minimum expenditure of metal. 1

At the mouth of the cowl, the plates 3, a, and 5 are inserted into a split pipe, forming a bead 6, as indicated in dotted lines in Fig. 2, and the longitudinal edges of said plates are united. in any convenient manner,as by rivets, indicated at 7.

In the description and claims, as a matter of convenience of terminology, it has been assumed that the cowl will be used in connection with the production of a forced draft, and the terms front and rear or back have been employed to designate their relation to a cowl thus employed. l'lowever, it is not intended thereby to preclude the use of the cowl in connection with an exhaust ventilator, wherein the arrangement of the parts will be reversed.

Having thus described my invention, what I claim is 1. A ventilator cowl comprising a lower portion substantially circular in cross-sec tion and an enlarged longitudinally curved upper portion extending therefrom, said cowl having a front plate of constant width extending longitudinally thereof and transversely c'urved'throughout its entire length on a radius substantially equal to the radius of the lower portion of said cowl.

2. A ventilator cowl comprising a lower .portion substantially circular in cross-sec tion and an enlarged longitudinally curved upper portion extending therefrom, said cowl having a back plate of constant width extending longitudinally thereof and trans" versely curved throughout its entire length on a radius substantially equal to the radius of the lower portion of said cowl.

3, A ventilator cowl comprising a-lower portion substantially circular in cross-section and an upper enlarged portion. extending therefrom and having an elliptical mouth, said cowl comprising a front plate and a back plate both of which are of constant width and longitudinally curved and each of which is transversely curved throughout its entire length on a radiussubstantially equal to the radius of the lower portion of said cowl.

4. A ventilator cowl comprising a lower portion substantially circular in crosssection andan upper enlarged longitudinallycurved portion extending therefrom, said cowl having longitudinally curved front and back plates of constant width, each of said plates being also transversely curved throughout its entire length on a radius substantially equal to the radius of the lower portion of said cowl, said cowl having an the lower portion of said cowl, said cowl having an elliptical mouth the major axis whereof is substantially twice the radius of the lower portion of said cowl and the minor axis thereof is substantially one and onehalf times said radius.

6. A ventilator cowl comprising a lower portion substantially circular in cross-section and a longitudinally curved and flared upper portion extending therefrom, said cowl having front and back plates each of which is of constant width and longitudinally curved and each of which is transversely curved on a radius substantially equal to the radius of the lower portion of said cowl, and intermediate longitudinally and transversely curved plates connecting the front and back plates, the'said plates providing at their upper ends an elliptical mouth the major axis whereof is substantially twice the diameter of the lower'portion of the cowl and the minor axis whereof is substantiallyone and one-half times such diameter.

l. A ventilator cowl comprising a lower portion substantially circular in 'cross-section and a longitudinally curved and flared upper portion extending therefrom, sald cowl having a front and a back plate each of which is of constant width and longitudithe front and back plates, the said plates,

providing at their upper ends an elliptical mouth the ma or axis whereof 1s substantially twice the diameter of' the lower pore tion of the cowl.

In testimony whereof, I hereunto affix my signature.

JOHN eenoae'n 

